AVONDALE, Ariz. — It’s the 50th anniversary of Phoenix International Raceway and racing royalty will be in town for the event, including racing legends Richard Petty, Bobby Allison, A.J. Foyt and the 1983 Indy 500 winner Tom Sneva from Scottsdale.

About 10,000 RVs and more than 100,000 fans have turned PIR into its own city.

Drivers will be running practice and qualifying laps Friday morning. NASCAR officials are keeping a close eye on the storms in California that will be making a run on Arizona over the weekend.

A track spokesman, Zac Emmons, said plans are in place to deal with possible rain delays.

“We will update fans every half hour throughout any delay using our social media accounts. We have a mobile app that will be used along with text messaging. We will use our PA systems and video systems as well,” he said.

Last weekend’s Daytona 500 in Florida was delayed six hours because of rain. PIR has the same heavy-duty drying systems to get the track in shape after a rain. Saturday’s race will be completed even if that means running into night.